Q. RF amplifiers are used in radio receivers for ?
  • (A) Improved image frequency rejection
  • (B) Improved rejection of adjacent unwanted signals
  • (C) Prevention of radiation of the local oscillator through the antenna of the receiver
  • (D) All of the other options
💬 Discuss
✅ Correct Answer: (A) Improved image frequency rejection
Q. During heterodyne process in a receiver the modulation of the signal ?
  • (A) Is totally eliminated
  • (B) Remains unaffected
  • (C) Increases
  • (D) decreases
💬 Discuss
✅ Correct Answer: (B) Remains unaffected
Q. AFC and AGC are respectively ?
  • (A) Audio frequency control and automatic gain control
  • (B) Audio frequency control and automatic gate control
  • (C) Amplitude frequency control and automatic gain control
  • (D) Automatic frequency control and automatic gain control
💬 Discuss
✅ Correct Answer: (D) Automatic frequency control and automatic gain control
Q. Modulation of signal during heterodyne process in a receiver ?
  • (A) Decreases
  • (B) Finished totally
  • (C) Increases
  • (D) Remains unchanged
💬 Discuss
✅ Correct Answer: (D) Remains unchanged
Q. A super heterodyne receiver with an intermediate frequency of 450 KHz is tuned to a signal at 1100 KHz, the image frequency is ?
  • (A) 650 KHz
  • (B) 1550 KHz
  • (C) 800 KHz
  • (D) 2000 KHz
💬 Discuss
✅ Correct Answer: (D) 2000 KHz
Q. Which of the following stage in a radio receiver provides the maximum image signal selectivity ?
  • (A) Frequency mixer
  • (B) RF amplifier
  • (C) Audio amplifier
  • (D) IF amplifier
💬 Discuss
✅ Correct Answer: (D) IF amplifier
Q. Value of standard IF of AM receiver is ?
  • (A) 455 KHz
  • (B) 10.7 MHz
  • (C) 107 KHz
  • (D) 455 MHz
💬 Discuss
✅ Correct Answer: (A) 455 KHz
Q. In a radio transmitter, the frequency of the crystal oscillator will be stable for a long time if the quality factor of the crystal resonator is ?
  • (A) > 100
  • (B) > 500
  • (C) >1000
  • (D) > 20000
💬 Discuss
✅ Correct Answer: (C) >1000
Q. In an IF amplifier, the IF transformer is provided with tapping to ?
  • (A) Increase the voltage gain
  • (B) Increase the bandwidth of the resonance circuit
  • (C) Increase the impedance offered by the resonance circuit to the following cascaded amplifier
  • (D) Increase the quality factor of the resonance circuit
💬 Discuss
✅ Correct Answer: (A) Increase the voltage gain
Q. Standard AM broadcast stations usually use what type of transmitting antennas ?
  • (A) Log periodic
  • (B) Driven collinear array
  • (C) Marconi array
  • (D) Yagi - Uda
💬 Discuss
✅ Correct Answer: (C) Marconi array

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